Key concept image registration

[RyanDoesMath]

Pull Request: Add Image Registration Documentation

Description:

This pull request adds a new documentation file explaining Image Registration and its role in our project.

Changes:

• A new file named image_registration.rst has been added to the docs folder.
• The file details the motivation for image registration, its definition, and how it's implemented in our project using homography transformation.
• Images are included to illustrate camera distortion and the homography concept.
• References are provided for further reading.

Files Changed:

• docs/image_registration.rst (added)

Finishes https://github.com/orgs/Paper-Chart-Extraction-Project/projects/1?pane=issue&itemId=69532416